Orbiting inside the red giant’s fiery plasma, the companion struggled to stay afloat and spiraled rapidly toward its partner’s core. The two stars would have collided, had the giant not simultaneously sputtered, hurling off material and shrinking enough for the companion to emerge from the envelope, ending its fatal dive. Today the two orbit each other peacefully at something like the distance between Venus and the sun. The interaction ended as quickly as it had begun, and, had astronomers built ALMA a couple hundred years earlier, they might have been able to watch it in real time.
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Astronomers caught a star-on-star smack down - Popular Science
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